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Fig. 15.4
B2 H
=(
1
−
EXP
(
LOGN
(
S2 H
)
∗
DT
/
1
))
/
DT
(15.7)
B2 D
=(
1
−
EXP
(
LOGN
(
S2 D
)
∗
DT
/
1
))
/
DT
(15.8)
Figure 15.5 shows the combined result of the population dynamics due to natural
increases and deaths as well as migration. Over the long run, the population of each
field is clearly responding to changes in the local carrying capacity. Numbers are
slow to build up in both fields when the start is 0.1 healthy and diseased adults in
each field. Surprisingly, neither field's total population hugs the carrying capacity
very well in this graphed run, although that effect was evident in some other runs.
Clearly factors other than carrying capacity are important. While we have required
that 10% of healthy adults migrate, we are not seeing the diseased population expand
to fill that gap.
